po4a version 0.70 and newer appear to have changed the API enough that the IkiWiki po plugin is broken.
This was reported as a FTBFS bug in Debian: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1072760
I think this patch is sufficient: https://salsa.debian.org/jmtd/ikiwiki/-/commit/65f13f08901806a3b458cd625369e27bf19722e0
— Jon, 2024-06-11
I've pushed a Debian package update with a slightly more involved patch:
I'm unavailable for a couple of weeks so I'll let it "soak" in Debian before committing it here. — Jon, 2024-06-12